A nondiscriminating pure monopoly must decrease the price on all units of a product to sell more units because there are barriers to entry in pure monopoly.
1) Should be a single seller.
2) Barrier should be present so that competitors can enter the market.
3) There must be no close substitute for the product or there must be some other economic barrier that prevents users from using substitute.
The points which explains why :
a) There are barriers to entry in pure monopoly.
b) A monopoly has demand of curve.
c) Average revenue is greater than marginal revenue.
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